Methods Objective monitoring method was used to studied the incidence and the related risk factors of nosocomial infection of lower respiratory tract.

方法采用目标性监测的方法对神经外科病人术后下呼吸道医院感染发病率及相关危险因素进行调查分析。

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OBJECTIVE to study the epidemiological features of hospital lower respiratory tract infection in order to adopt effective control methods.

目的探讨医院下呼吸道感染流行病学特点，以便采取有效的控制措施。

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RESULT After the filter used, the rate of nosocomial lower respiratory tract infection is reduced obviously, and breathing circuit almost have no bacteria colonized.

结果使用生物过滤器后医院下呼吸道感染发生率显著下降，呼吸回路螺纹管内几乎无细菌寄居。

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He said estimates suggested that each year passive smoking in children accounted for more than 20, 000 cases of lower respiratory tract infection, 200 cases of bacterial meningitis, and 40 sudden infant deaths.

BBC: Smoking in the car 'breaks toxic limit'